CN1385603A - Crankshaft connecting rod mechanism for eccentric crank of reciprocative piston type internal combustion engine - Google Patents
Crankshaft connecting rod mechanism for eccentric crank of reciprocative piston type internal combustion engine Download PDFInfo
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- CN1385603A CN1385603A CN 02123737 CN02123737A CN1385603A CN 1385603 A CN1385603 A CN 1385603A CN 02123737 CN02123737 CN 02123737 CN 02123737 A CN02123737 A CN 02123737A CN 1385603 A CN1385603 A CN 1385603A
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- piston
- crankshaft
- combustion engine
- connecting rod
- internal combustion
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The present invention relates to a crankshaft connecting bar linkage of offset crankshaft of reciprocating piston internal combustion engine, belonging to the field of internal combustion engine technology. Said linkage mechanism includes piston, connecting bar and crankshaft, the piston is placed in the cylinder or internal combustion engine, the connecting bar is linked with the piston by means of piston pin, and the crankshaft is linked with connecting bar by means of crank pin. The centre if the described crankshaft is offset, the offset amount L is 3-35% of radius of crankshaft. Said invented special structure can effectively reduce pressure of piston to side surface of cylinder, can reduce the energy consumed by friction, prolong the service life of cylinder and piston, also can reduce the discharge of harmful gas nitrogen oxide.
Description
Technical field
The present invention relates to a kind of crankshaft ﹠ connecting that is used for the offset crankshaft of stroke piston combustion engine, belong to technical field of internal combustion engines.
Background technique
According to the working principle of conventional reciprocating internal-combustion piston engine, as expecting the high thermal efficiency, near perfect combustion piston is positioned at top dead center time of the fuel that will manage to make internal-combustion engine makes it the constant volume combustion that reaches desirable.But the structure according to existing stroke piston combustion engine obviously can't realize, because present structure is that the center line of bent axle is at cylinder, on the vertical center line of piston, the free process of burning, if catch fire too early, piston is just up, spent high temperature and high pressure gas acts on piston top in the cylinder, so not only can make internal-combustion engine bear strong mechanical load, make its rough running, but also to consume lot of energy, the energy consumption of internal-combustion engine is increased, if caught fire evening, the bigger distance of burning then that at the end piston is descending, the volume on piston top increases too many, and the pressure on piston top is reduced too much, and the result causes mean effective pressure to reduce, be to cause energy consumption to increase equally, power descends.
In addition because the center line of piston and the center line of bent axle are vertically superposed, when piston is positioned at top dead center and small distance of process atdc, be that bent axle is when turning over about 5 °～10 °, the pressure of explosion that piston bore also is maximum, but because at this moment just piston, bent axle and crank pin are on the vertical line or almost point-blank,, caused very big mechanical load on the contrary body, bent axle, connecting rod, the piston of entire internal combustion engine so not only maximum piston pressure does not at this moment have work done.
Summary of the invention
The objective of the invention is shortcoming, design a kind of connecting rod that is used for the offset crankshaft of stroke piston combustion engine, to improve the thermal efficiency of internal-combustion engine at prior art.
The connecting rod of the offset crankshaft that is used for stroke piston combustion engine of the present invention's design comprises piston, connecting rod and crankshaft crank, and piston places in the cylinder of internal-combustion engine, and connecting rod is by wrist pin and piston interlock, and bent axle is by crank pin and connecting rod interlock.Described crankshaft center biasing, Offset L is the 3-35% of crank throw (being the distance of crankshaft center to the crank pin center) R.
The connecting rod of the offset crankshaft that is used for stroke piston combustion engine of the present invention design, its advantage are that internal-combustion engine can be near desirable constant volume combustion, thereby improve the thermal efficiency of internal-combustion engine.Because its special structure can reduce the pressure of piston countercylinder side effectively, and then the energy of reducing friction and being consumed, and prolong the working life of cylinder and piston.At last, special construction of the present invention can also reduce the discharging of harmful gas nitrogen oxides.
Description of drawings
Fig. 1 is that the position between piston in the traditional combustion engine, connecting rod, the bent axle concerns schematic representation.
Fig. 2 is the schematic representation of the crank mechanism that designs of the present invention.
Among Fig. 1 and Fig. 2, the 1st, piston, the 2nd, wrist pin, the 3rd, cylinder, the 4th, connecting rod, the 5th, crank pin, the 6th, crankshaft crank, the 7th, crankshaft center, the 8th, crank pin rotating locus.
Embodiment
The connecting rod of the offset crankshaft that is used for stroke piston combustion engine of the present invention's design, its structure as shown in Figure 2, comprise piston 1, connecting rod 4 and crankshaft crank 6, piston 1 places in the cylinder 3 of internal-combustion engine, connecting rod 4 is by wrist pin 2 and piston 1 interlock, and crankshaft crank 6 is by crank pin 5 and connecting rod 4 interlocks.Described bent axle biasing, Offset L is the 3-35% of crank throw R, Offset L is that crankshaft center is to the distance between the cylinder vertical center line.
In the structure of the present invention's design, crankshaft axis can be offset a segment distance L to the left or to the right according to the sense of rotation difference of internal-combustion engine.The method of decision offset direction is: from the front of view, if crankshaft crank 6 then is offset to the left, otherwise then moves to the right to the clockwise direction rotation.The characteristics of this structure are: piston 1 is when top dead center m, connecting rod 4 has formed a little pivot angle β with the vertical center line of piston 1, because the existence of offset or dish L and connecting rod pivot angle β, in the time of near piston is positioned at top dead center m, crank 6 can obtain the angle of swing bigger than traditional combustion engine structure.This is because when the piston arrives top dead center, crankshaft crank 6 continues rotation, and at this moment connecting rod 4 also will be along with moving of crank pin 5 to the vertical center line swing of piston, when the center of crank pin 5 moves on the cold vertical center line of living, the center line of connecting rod also overlaps with the vertical center line of piston, at this moment because the moving of crank pin, make the wrist pin center along slightly reducing on the height of cylinder vertical center line, but simultaneously connecting rod 4 on the vertical center line of piston around wrist pin 2 swings, the central point that forces wrist pin moves up along the vertical center line of cylinder.The distance that wrist pin reduces and moves up, with the crankshaft pin center be the distance dependent of wrist pin center around turning radius R, the crankshaft axis of crankshaft center with the offset distance L of cylinder vertical center line and the length of connecting rod to the crank pin center.When piston 1 from top dead center begin descending, when crank turns over the α angle, compare with the same position of conventional construction, the distance that piston 1 moves down is little.So just can more approaching desirable constant volume combustion, and if well-known internal-combustion engine can be accomplished constant volume combustion, its thermal efficiency will improve greatly.
From structure of the present invention as can be seen, when the m position of crank pin 5 from figure rotates to n position on the piston vertical center line, piston almost can be ignored from the distance that top dead center moves down, but at this moment because the crankshaft center distance L of having setovered, produces the moment H of torsion
2Moment H than conventional construction
1Want big, the huge gas pressure that breaks out of piston top burning like this can more be transformed into torsion to bent axle than original structure.
Structure of the present invention, because the skew of crankshaft center, when making piston work done from top to bottom, angle α between connecting rod 4 and the crank reduces, can reduce piston effectively to cylinder side lateral pressure, thereby can reduce the energy that consumes owing to the friction between piston and the cylinder wall, improve the thermal efficiency of internal-combustion engine, and can prolong the working life of cylinder and piston.
Structure of the present invention, crank pin rotates to the n point that the central vertical line of connecting rod and piston coincides from top dead center m, the descent of piston distance is less relatively, simultaneously because the biasing of bent axle, the pressure that acts on piston top can obtain bigger moment of torsion, so can suitably reduce ignition advance angle (for petrol engine) or injection advance angle (for diesel engine), thereby discharging that can corresponding minimizing harmful gas nitrogen oxides.
Two embodiments of the present invention are:
Embodiment one:
Be used for the internal-combustion engine of 110 millimeters of cylinder diameters, 120 millimeters of piston strokes, 60 millimeters of crank throws, the side-play amount of crankshaft center is 15 millimeters, and the bent axle moment of torsion improves 10%.
Embodiment two:
Be used for the internal-combustion engine of 80 millimeters of cylinder diameters, 80 millimeters of piston strokes, 40 millimeters of crank throws, the side-play amount of crankshaft center is 8 millimeters, and the bent axle moment of torsion improves 10%.
Claims (1)
1, a kind of connecting rod that is used for the offset crankshaft of stroke piston combustion engine, comprise piston, connecting rod and crankshaft crank, piston places in the cylinder of internal-combustion engine, connecting rod is by wrist pin and piston interlock, bent axle is by crank pin and connecting rod interlock, it is characterized in that described crankshaft center biasing, Offset L is the 3-35% of crank throw R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123737 CN1385603A (en) | 2002-06-21 | 2002-06-21 | Crankshaft connecting rod mechanism for eccentric crank of reciprocative piston type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02123737 CN1385603A (en) | 2002-06-21 | 2002-06-21 | Crankshaft connecting rod mechanism for eccentric crank of reciprocative piston type internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1385603A true CN1385603A (en) | 2002-12-18 |
Family
ID=4745198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02123737 Pending CN1385603A (en) | 2002-06-21 | 2002-06-21 | Crankshaft connecting rod mechanism for eccentric crank of reciprocative piston type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1385603A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256118A (en) * | 2013-04-28 | 2013-08-21 | 重庆小康工业集团股份有限公司 | Piston type engine offset crankshaft connecting rod mechanism |
| CN104131897A (en) * | 2014-08-28 | 2014-11-05 | 刘俊峰 | Reciprocating piston four-stroke engine |
| CN106014630A (en) * | 2016-07-22 | 2016-10-12 | 李殿亮 | Movable-type reciprocating piston-type internal combustion engine and assembly method and power output mechanism thereof |
| CN107956784A (en) * | 2017-11-24 | 2018-04-24 | 中国第汽车股份有限公司 | A kind of crank-connecting rod mechanism for engine |
| CN111677588A (en) * | 2020-06-26 | 2020-09-18 | 王井亮 | Eccentric device for crankshaft of internal combustion engine |
-
2002
- 2002-06-21 CN CN 02123737 patent/CN1385603A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103256118A (en) * | 2013-04-28 | 2013-08-21 | 重庆小康工业集团股份有限公司 | Piston type engine offset crankshaft connecting rod mechanism |
| CN104131897A (en) * | 2014-08-28 | 2014-11-05 | 刘俊峰 | Reciprocating piston four-stroke engine |
| CN106014630A (en) * | 2016-07-22 | 2016-10-12 | 李殿亮 | Movable-type reciprocating piston-type internal combustion engine and assembly method and power output mechanism thereof |
| CN107956784A (en) * | 2017-11-24 | 2018-04-24 | 中国第汽车股份有限公司 | A kind of crank-connecting rod mechanism for engine |
| CN111677588A (en) * | 2020-06-26 | 2020-09-18 | 王井亮 | Eccentric device for crankshaft of internal combustion engine |
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